Machine for grinding bone



(No Mbdel.)

'H. P. CHAPMAN. MACHINE FOR GRINDING BONE.

Pateilted Aug. 6, 1895.

of Connecticut, have invented certain new and inder forming one end of each of the boxes UNITED STATES PATENT OFFICE.

HENRY P. CHAPMAN, OF IVORYTON, CONNECTICUT.

MACHINE FOR GRINDING BDNE.

SPECIFICATION forming part of .Letters Patent No. 544,087, dated August 6, 1895.

Application filed April 11, 1895.

2b aZZ whom it may concern: j

Be it known that I, HENRY P. CHAPMAN, a citizen of the United States, and a resident of Ivoryton, in the county of Middlesex and State useful Improvements in Machines for Grinding Bone, of which the following is a full, clear, and exact description, whereby any one skilled in the art can make and use the same.

My invention relates to the class of machines which are particularly adapted and devised for the purpose of grinding bone as feed for fowls; and the object of the invention is to provide a machine of this class that shall be compact in construction, simple in operation, and can be operated to produce a better result with less power than prior machines of this class.

To this end my invention consists in the details of the several parts making up the device as a whole and in the combination of such parts, as more particularly hereinafter described, and pointed out in the claims.

Referring to the drawings, Figure 1 is a top or plan view of a machine embodying my invention with parts of the machine broken away to illustrate the construction. Fig. 2 is a side view of the same with parts broken away to show construction. Fig. 3 is a detail view in horizontal section through the cylinder, showing the manner of supporting the cutters. Fig. at is a detail view, on an enlarged scale, illustrating the construction of the knife and the manner in which the points of the serrated edges are staggeredthat is, caused to drag in lines parallel to each other. Fig. 5 is a detail edge view of the divided nut. Fig. 6 is a detail plan view of the divided nut.

As embodied herein the hoppers in which the material is placed consist of a long boxlike structure, within which is mounted arotary grinding-cylinder, the surface of the cylor hoppers which are located on each side of said-cylinder, and owing to the arrangement of the hoppers on opposite sides ofthe grinding-cylinder, which carries the cutting devices, the material can be forced from opposite directions against the surface of the cutters in the periphery of the cylinder and the pressure from each side he thus counterbal- Serial No. 545,299. (No model.)

anced, this enabling the cutters to be driven with a minimum expenditure of power.

In the accompanying drawings, the letter a denotes the oblong box, each end of which forms a hopper a, each of these hoppers being closed bya removable cover a Each of these covers has pivoted thereon a lockinglever 0. on the ends of which are preferably formed handles, and catchesa, are secured to the side of the box in a position to engage each of the levers on opposite sides when they are swung to a position crosswise of the cover, and thus hold the latter securely in place.

A grinding-cylinder b is mounted in the box a, preferably at about the center, this grinding-cylinder extending through the box from top to bottom. Grinding-knives b are knives when viewed in a horizontal plane.

presenting a staggered appearance, as shown in Fig. 4: of the drawings.

The openings through the wall of the cylinder in which the knives b are mounted are made similar to the mouth of a plane-that is, space is leftbelow the cutting-edge of the knife for the passage of the comminuted bone into the hollow of the cylinder and from there into any form of receptacle below it. Each;

knife has preferably a clamp screw c passing through a lengthwise slot in the blade and into a threaded socket in the cylinder, and in line with the blade there is mounted in a threaded opening a feed screw 0, transversely of which is located the clamp-screw 0, these devices being provided for the purpose of setting the blade to the proper position for cutting coarser or finer, as may be desired.

On the upper end of the cylinder b is secured at bevel gear-wheel d that is in mesh with a pinion a secured to the driving-shaft e. A hand-wheel e is secured to the outer but permitting a free rotary movement.

end of the shaft cas a means of transmitting power thereto, or any other device for driving the shaft 6 may be employed. A handle is secured to the wheel 6 as a means of turning the same.

In each of the end walls a of the box a is mounted a flanged sleeve f having secured thereto a ratchet-wheel g, the flange on the sleeve resting against the inner wall of the end of the box and the hub of the ratchetwheel against the outer wall, thus holding the wheel against any lengthwise movemenfi follower h fits within the hopper and is movable pistonwise back and forth therein, the threaded shaft h secured to the follower extending through the sleeve fand also through a not connected to the sleeve, the nut being preferably arranged as hereinafter described. Rock-shafts t are mounted in bearings on opposite sides of the box at each end thereof, and to these rock-shafts are secured upwardextending arms 7., on the end of which are mounted rollers 1?. These rollers are located in the path of movement of lugs d, secured to the under surface of the gear-wheel d, the lugs as they encounter the under surface of each of the rollers 2' causing each of the shafts i and the arms 1' to be rocked upward. To the outer end of each of the rock-shaftsc' are secured pawl-arms 7a, to the upper ends of which are pivoted pawls 7c, the outer end of each of the pawls 7t engaging notches in the surface of the ratchet-wheel g.

The operation of the device is as follows: The covers 0. having been removed and bone or like material placed within the hoppers, the covers are replaced and securely locked in place by means of the locking-levers a, the amount of material placed in the hoppers being sufficient to fill the space between the followers h and the surface of the grindingcylinder 17. As the wheel 6 is turned, rotation is imparted to the gear-wheel d and grindingcylinder b, causing the knives b to be brought successively into contact with the contents of the hopper, which are finely ground thereby, the ground particles passing through openings in the surface of the cylinder adjacent to the knives. As the lugs d'come into contact with the under surface of the rollers t the rock-shafts 2' and arms t" are rocked upward, causing the pawls that have engaged notches in the ratchet-wheels g to rotate said ratcl1et-wheel a short distance. As the lugs (1 pass from under the rollers t" the shaft t' is rocked back to its normal position by the weight of the parts secured thereto. This construction gives to each of the followers h a step-by-step movement until all of the material contained within the hopper has been forced up against the surface of the grind ing-cylinder.

In order to provide for a quick and ready return of the followers to the outer end of each hopper, so as to put the machine in position for further grinding operation, I prefer to provide a divided nut m,,secured to the end walls of the hopper, the nut being divided through its center, the two parts being hinged together and held in engagement to form a complete nut by means of a catch device Z. By unlocking the latch the nut may be opened so as to allow the threaded portion of the shaft to be disengaged therefrom and readily pulled lengthwise through the opening until the follower has reached the outer limit of its play. The nut is then closed, the threaded parts of nut and shaft again engaged and the machine is in position, when the cover is placed and the material filled into the hopper, to renew the grinding operation. The exact position of the divided nut, whetheron the inside or outside of the end wall, is not material.

I claim as my invention- 1. In combination in a bone grinding machine, a box, a grinding cylinder mounted therein and forming the end walls of hoppers located on opposite sides thereof, knives projecting from the surface of the cylinder, a gear wheel secured to the upper end of the cylinder, apinion in mesh with the gear wheel, a driving shaft secured to the pinion, lugs borne on the gear wheel, a rock shaft located in operative relation to said lugs to be rocked thereby, pawls secured to the rock shaft, a ratchet wheel borne in the end of the box and held against lengthwise movement but free to rotate therein and in engagement with the pawls, and a feed located within the hopper and having a threaded shank extending through the threaded inner surface of the ratchet wheel, all substantially as described.

2. In combination in a bone grinding machine, a box, a grinding cylinder mounted in the box, grinding knives projecting from the cylinder, at cog wheel secured to the upper end of the cylinder, a pinion secured to a driving shaft and in engagement with the cog wheel, the driving shaft, means for rotating the same, lugs borne on the gear wheel, rock shafts secured on opposite sides of the box and of the cylinder and having arms adapted to be engaged by the under surface of the lugs, a pawl borne on each rock shaft and in engagement with a ratchet wheel, ratchet wheels secured in each end of the box against lengthwise movement but free to rotate therein, followers located on opposite sides of the grinding cylinder and having shafts with threads of opposite pitch fitting corresponding threads on each of the ratchet wheels, all substantially as described.

3. In combination in a bone grinding machine, a box, a grinding cylinder mounted therein and forming the end walls of ahopper on each side thereof, knives projecting from the surface of the cylinder, a gear wheel se cured to the upper end of the cylinder, a pinion secured to a driving shaft and in engagement with the cog wheel, the driving shaft, means for rotating the driving shaft, lugs borne on the gear wheel, rock shafts secured on opposite sides of the box and of the openings of opposite pitch in each of said :0 cylinder and having arms for engagement collars, and followers located on opposite with the upper snrface of the lugs, a pawl sides of the grinding cylinder and having pivotally connected with each rock shaft; and screw threaded shanks fitting the openingin 5 in engagement with a ratchet wheel, ratchet the collars, all substantially as described.

wheels secured to the outer end of a flanged HENRY P. CHAPMAN. collar in each end of the box, collars secured Witnesses: in each end of the box and having a flange B. A. RATHBUN,

on their inner ends and with screw threaded l LIZZIE I. RATHBUN. 

